Frank w



llhnrrnn drains Patient prion.

FRANK IV. MIX, OF STAMFORD, CONNECTICUT, ASSIGNOR TO TIIE YALE dz TOIVNE MANUFACTURING COMPANY, OF SAME PLACE.

BOLT FOR LOCKS.

SPECIFICATION forming part of Letters Patent No. 608,784, dated August 9, 1898.

Application filed November 16, 1897. Serial No. 668,759. (No model.)

To aZZ whom it may concern.-

Be it known that I, FRANK WV. MIX, a citizen of the United States, and a resident of Stamford, in the county of Fairfield and State of Connecticut,have invented certain new and useful Improvements in Bolts for Locks, of which the following is a specification.

In the better class of locks the trade demands that exposed portions of door-fittings shall be of bronze or other materials more expensive than those used in the construction of the case and interior parts of the lock. To construct an entire bolt of bronze would be too expensive, and the tail of the bolt would not be strong enough to give the service required of it, for it is required that locks be made as thin as possible and the tails of bolts should be made of flat metal. It is also desirable to make the parts of stamped metal.

My invention meets the requirements by providing a fiat metal tail, of steel or equi valent metal, and a built-up head, of bronze or other metal, thereon, tenon-jointed thereto, preferably by having the end of the tailpiece engage with one of the component parts of the head,while the joint is completely covered and obscured by the other part or parts thereof.

In carrying out my invention I preferably shape or out out the end of the tailpiece and the adjacent edge of one lamina of the builtup head to form a tenon-joint or so that these parts will engage laterallyand hold together against displacement, and I then apply to the sides of these interlocked parts overlapping plates, of bronze or other metal. The com ponent plates of the head correspond in outline to the vertical section of the bolt-head and are suliicient in number to build up the head to the desired size. In practice I prefer to dovetail or otherwise form the interengaging parts of the tail and head, so that they will also interlock against longitudinal displacement.

My invention will-be fully understood upon reference to the accompanying drawings, in which- Figure 1 is a perspective view of a complete bolt constructed in accordance with my invention. Fig. 2 is a perspective view of the segregated parts of the bolt, showing a form of engaging parts wherein they interlock.

Fig. 3 is a similar view showing another form of engaging parts.

1 represents the tail of the bolt, and 2 the head, which is made up of a number of laminre or plates corresponding in outline to the vertical section of the bolt, the number being determined by the size or thickness of which it is desired to have the bolt. In forming the bolt I cut out or shape the outer end as shown at 1 in Fig. 2 or as at 1 in Fig. 3 and a corresponding recess 1" or 1 in the central plate or lamina 2, which is to form part of the head. These parts are then fitted together, and additional plates or laminae 2 are applied on opposite sides in such a manner asto overlap the interengaging parts 1 and 2 or 1 and 2. Perforations 4 5 are drilled in the parts in the proper positions, and into these perforations pins or rivets 3 are introduced, so as to hold all the parts together to form a solid head. The head may then be trimmed or finished.

The form of joint shown in Fig. 2 provides for interlocking of the parts both laterally and longitudinally, while the form shown in Fig. 3 simply provides for lateral engagement; but in the latter form the rivets are entirely sufficient to hold the parts securely against longitudinal disengagement.

Inasmuch as the plates or lamime 2 2 are of bronze or other metal suitable to form the exposed portion of the bolt and the engaging end of the tailpiece 1 is completely obscured by them, it will be seen that I have provided a bolt of cheap, durable, and attractive appearance, of which the head or portion ex posed to view is practically formed of solid bronze or other ornamental metal with all the wearing qualities thereof, while the tailpiece is of steel and embodies all the advantages of cheapness, strength, and durability required of that portion of the bolt.

I do not herein claim anything disclosed by the application of Warren H. Taylor, filed October 1, 1897, Serial No. 654,080.

Having thus described my invention, the following is what I claim as new therein and desire to secure by Letters Patent:

1. A bolt comprising a tailpiece formed with a tenon anda separately-formed head secured thereto and consisting of a series of plates or laminae, one of which is partly cut away to receive the tenon formed on the end of the tailpiece whereby the head and the tailpiece engage together, as explained.

22. A bolt formed of a tailpiece, a head-form ing plate engaging said tailpiece, a lateral head-forming plate covering the joint between the two parts first named, and rivets passing through the outer plate and the tailpiece and through the head-forming plates, substantially as set forth.

3. A bolt comprising a tailpiece and a builtup or laminated head secured thereto; the end of the tailpiece and one of the plates or laminae of the head being constructed to interlock by a substantially dovetailed joint, 

